GNOME Display Manager up to 2.21.0 Directory /tmp/.X11-unix/ link following

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability was found in GNOME Display Manager up to 2.21.0. It has been rated as problematic. The impacted element is an unknown function of the file /tmp/.X11-unix/ of the component Directory Handler. This manipulation causes link following. This vulnerability is handled as CVE-2013-4169. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in GNOME Display Manager up to 2.21.0. Affected by this vulnerability is an unknown function of the file /tmp/.X11-unix/ of the component Directory Handler. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

GNOME Display Manager (gdm) before 2.21.1 allows local users to change permissions of arbitrary directories via a symlink attack on /tmp/.X11-unix/.

The weakness was released 09/05/2013 by vladz as confirmed mailinglist post (oss-sec). It is possible to read the advisory at seclists.org. The public release was coordinated with GNOME. This vulnerability is known as CVE-2013-4169 since 06/12/2013. Attacking locally is a requirement. The successful exploitation requires a single authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 69791 (CentOS 5 : gdm / initscripts (CESA-2013:1213)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 156676 (Oracle Enterprise Linux Security Update for gdm (ELSA-2013-1213)).

Upgrading to version 2.21.1 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (69791), SecurityFocus (BID 62247†), OSVDB (96983†), Secunia (SA54661†) and Vulnerability Center (SBV-41384†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 69791
Nessus Name: CentOS 5 : gdm / initscripts (CESA-2013:1213)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881788
OpenVAS Name: CentOS Update for gdm CESA-2013:1213 centos5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Display Manager 2.21.1

Timelineinfo

10/31/2007 🔍
06/12/2013 +2051 days 🔍
09/05/2013 +85 days 🔍
09/05/2013 +0 days 🔍
09/05/2013 +0 days 🔍
09/06/2013 +1 days 🔍
09/06/2013 +0 days 🔍
09/09/2013 +3 days 🔍
09/09/2013 +0 days 🔍
09/10/2013 +1 days 🔍
12/25/2024 +4124 days 🔍

Sourcesinfo

Vendor: gnome.org

Advisory: seclists.org
Researcher: vladz
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-4169 (🔍)
GCVE (CVE): GCVE-0-2013-4169
GCVE (VulDB): GCVE-100-10171

OVAL: 🔍

SecurityFocus: 62247 - GNOME GDM CVE-2013-4169 Insecure Temporary File Creation Vulnerability
Secunia: 54661 - Red Hat update for gdm, Not Critical
OSVDB: 96983
Vulnerability Center: 41384 - GNOME Display Manager before 2.21.1 Local Symbolic Link Attack, Medium

Entryinfo

Created: 09/09/2013 17:33
Updated: 12/25/2024 18:45
Changes: 09/09/2013 17:33 (80), 05/10/2017 10:35 (2), 05/24/2021 08:53 (3), 12/25/2024 18:45 (18)
Complete: 🔍
Committer:
Cache ID: 216::103

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